www.vishay.com

Document Number: 81745

74

Rev. 1.2, 19-Aug-08

TSOP312.., TSOP314..

Vishay Semiconductors

IR Receiver Modules for

Remote Control Systems

SUITABLE DATA FORMAT

The TSOP312.., TSOP314.. series are designed to suppress

spurious output pulses due to noise or disturbance signals.

Data and disturbance signals can be distinguished by the

devices according to carrier frequency, burst length and

envelope duty cycle. The data signal should be close to the

band-pass center frequency (e.g. 38 kHz) and fulfill the

conditions in the table below.

When a data signal is applied to the TSOP312.., TSOP314..

in the presence of a disturbance signal, the sensitivity of the

receiver is reduced to insure that no spurious pulses are

present at the output. Some examples of disturbance signals

which are suppressed are:

• DC light (e.g. from tungsten bulb or sunlight)

• Continuous signals at 38 kHz or at any frequency

• Strongly or weakly modulated noise from fluorescent

lamps with electronic ballasts (see figure 15 or figure 16)

Fig. 15 - IR Signal from Fluorescent Lamp

with Low Modulation

Fig. 16 - IR Signal from Fluorescent Lamp

with High Modulation

Note

For data formats with short bursts please see the datasheet for TSOP311.., TSOP313..

010

15

20

Time (ms)

16920

IR Signal from Fluorescent

Lamp with Low Modulation

5

010

15

20

Time (ms)

16921

IR Signal from Fluorescent

Lamp with High Modulation

10

TSOP312..

TSOP314..

Minimum burst length

10 cycles/burst

10 cycles/burst

After each burst of length

a minimum gap time is required of

10 to 70 cycles

≥ 10 cycles

10 to 35 cycles

≥ 10 cycles

For bursts greater than

a minimum gap time in the data stream is needed of

70 cycles

> 4 x burst length

35 cycles

> 10 x burst length

Maximum number of continuous short bursts/second

1800

1500

Compatible to NEC code

yes

yes

Compatible to RC5/RC6 code

yes

yes

Compatible to Sony code

yes

no

Compatible to Thomson 56 kHz code

yes

yes

Compatible to Mitsubishi code (38 kHz, preburst 8 ms, 16 bit)

yes

no

Compatible to Sharp code

yes

yes

Suppression of interference from fluorescent lamps

Most common disturbance

signals are suppressed

Even extreme disturbance

signals are suppressed